scholarly journals Ultra-violet Gas Laser at Room Temperature

Nature ◽  
1963 ◽  
Vol 200 (4907) ◽  
pp. 667-667 ◽  
Author(s):  
H. G. HEARD
Keyword(s):  
Room Temperature ◽  
Ultra Violet ◽  
Gas Laser

scholarly journals The Effect Of Thickness on The Optical Properties Of ZnS

2007 ◽  
Vol 4 (4) ◽  
pp. 647-652
Author(s):  
Baghdad Science Journal
Keyword(s):  
Band Gap ◽  
Room Temperature ◽  
Near Infrared ◽  
High Vacuum ◽  
Ultra Violet ◽  
Infrared Region ◽  
Complex Dielectric Constant ◽  
Film Properties ◽  
Corning Glass ◽  
Different Thickness

Zinc sulfide(ZnS) thin films of different thickness were deposited on corning glass with the substrate kept at room temperature and high vacuum using thermal evaporation technique.the film properties investigated include their absorbance/transmittance/reflectance spectra,band gap,refractive index,extinction coefficient,complex dielectric constant and thickness.The films were found to exhibt high transmittance(59-98%) ,low absorbance and low reflectance in the visible/near infrared region up to 900 nm..However, the absorbance of the films were found to be high in the ultra violet region with peak around 360 nm.The thickness(using optical interference fringes method) of various films thichness(100,200,300,and 400) nm.The band gap measured was found to be in the range (3.52 -3.78 )eV.

scholarly journals The ultra-violet absorption spectra of some complex aromatic hydrocarbons-I

1935 ◽  
Vol 152 (876) ◽  
pp. 299-324 ◽  
Author(s):  
William Valentine Mayneord ◽  
Edna, M. F. Roe ◽  
Ernest Laurence Kennaway
Keyword(s):  
Fluorescence Spectra ◽  
Room Temperature ◽  
Quantitative Measurement ◽  
Coal Tar ◽  
Ultra Violet ◽  
Incident Radiation ◽  
Absolute Amount ◽  
Theoretical Treatment ◽  
Pure Compound ◽  
Radiated Energy

During earlier work carried out in this Institute on carcinogenic mixtures obtained from coal-tar, a study of the fluorescence spectra of such mixtures gave useful indications of the type of compound present, and subsequently assisted in the separation of one of them, 1 : 2-benzpyrene. Very small quantities of material may often be detected by the study of fluorescence spectra, but the results are as a rule only qualitative. In general, at room temperature, the fluorescence spectra of hydrocarbons in solution consist of diffuse bands, and the total emitted energy is often very small and consequently difficult to measure. Moreover, the absolute amount of radiated energy depends on Ike energy distribution in the incident radiation, and on such experimental details as concentration of solutions, and size and shape of containing vessels. On the other hand, a quantitative measurement of the ultra-violet absorption spectrum of a solution of a pure compound can be made relatively easily, and not only furnishes a method of identification of the substance but serves as a basis for a theoretical treatment of its molecular structure.

Photoluminescence of Ge Nanoclusters in Ion Implanted SiO2

2002 ◽  
Vol 744 ◽  
Author(s):  
J.M.J. Lopes ◽  
F.C. Zawislak ◽  
M. Behar ◽  
P.F.P. Fichtner ◽  
L. Rebohle ◽  
...  
Keyword(s):  
Room Temperature ◽  
Depth Distribution ◽  
Rutherford Backscattering Spectrometry ◽  
Ultra Violet ◽  
Room Temperature Photoluminescence ◽  
Transmission Electron ◽  
Coarsening Behavior ◽  
The Mean ◽  
Luminescent Centers ◽  
Post Implantation

ABSTRACT180 nm thick SiO2 films produced by wet oxidation of (100) Si wafers were implanted at room temperature with 120 keV Ge+ ions at a fluence of 1.2×10 cm-2 in order to allow the formation of Ge nanoparticles upon post implantation thermal annealings within the interval 400°C ≤ T ≤ 900°C. The size and depth distribution of the Ge nanoparticles were characterized by Transmission Electron Microscopy and Rutherford Backscattering Spectrometry. In addition, the room temperature photoluminescence (PL) bands of the nanoparticles system were studied in the regions of the blue-violet and ultra-violet emissions. The mean diameter of the nanoclusters increases from 2.2 nm at 400°C to 5.6 nm at 900°C. Concomitantly, the blue-violet PL intensity increases by a factor of 12 within the same temperature interval. The results are discussed in terms of possible atomic mechanisms involved in the coarsening behavior and leading to the formation of luminescent centers.

The decomposition of solid azides by electron bombardment

1954 ◽  
Vol 223 (1153) ◽  
pp. 267-282 ◽  
Keyword(s):  
Thermal Decomposition ◽  
Room Temperature ◽  
Ultra Violet ◽  
Electron Bombardment ◽  
Barium Salt ◽  
Large Excess ◽  
Free Electrons ◽  
Violet Light ◽  
Mechanism Of Decomposition ◽  
Short Period

The decomposition of barium and sodium azide at room temperature brought about by electron bombardment using accelerating potentials of 100 to 200V and also the effect of short-period pre-bombardment on the rate of the subsequent thermal decomposition of the barium salt has been studied. Although many characteristics of the reaction are similar to those obtained in the previous investigations using ultra-violet light, there are some marked differences. These are attributed to the higher energies used in the primary beam so that ‘free’ electrons and not excitons are produced and to the large excess of electrons always available during bombardment. The theory proposed previously to explain the effects of pre-irradiation and prolonged photolysis, can, however, be extended to take into account these differences, and thereby provide an adequate mechanism of decomposition.

The Origin of Luminescence From Cerium Oxide on Silicon

1999 ◽  
Vol 560 ◽  
Author(s):  
Won Chel Choiv ◽  
Ho Nyung Lee ◽  
Yong Kim ◽  
Eun Kyu Kim
Keyword(s):  
Thin Films ◽  
Thermal Treatment ◽  
Cerium Oxide ◽  
Cerium Dioxide ◽  
Room Temperature ◽  
Ultra Violet ◽  
Blue Luminescence ◽  
Luminescent Material ◽  
Uv Emission ◽  
Thermally Treated

ABSTRACTAs the ultra-violet/blue luminescent material, we will introduce the thermal treated cerium oxide on silicon. It has been confirmed a violet/blue luminescence ranging from 358 rim to 450 rnm at room temperature from the thermally treated cerium-dioxide thin films on silicon. As a results of AES and HR-TEM measurement, it was confirmed that cerium silicates were generated by thermal treatment. These cerium silicates such as Ce4.667(SiO4)3O and Ce2Si2O7 are the source of the ultra-violet (UV) emission ranging from 358 nim to 450 nm (maximum at 388 rim).

Room-temperature spin injection and optical polarization in nitride-based blue and ultra-violet spin light-emitting diodes

2020 ◽  
Vol 13 (12) ◽  
pp. 123001
Author(s):  
Yaping Wu ◽  
Xuefeng Wu ◽  
Zhibai Zhong ◽  
Jiangpeng Zhou ◽  
Jiajun Chen ◽  
...  
Keyword(s):  
Room Temperature ◽  
Light Emitting Diodes ◽  
Spin Injection ◽  
Ultra Violet ◽  
Optical Polarization ◽  
Light Emitting

A Linear CCD Spectrometer Based on FPGA for Light-Source Characterization

2015 ◽  
Vol 763 ◽  
pp. 120-125 ◽  
Author(s):  
R.O. Ocaya
Keyword(s):  
High Speed ◽  
Data Exchange ◽  
Room Temperature ◽  
Ultra Violet ◽  
Source Characterization ◽  
Linear Ccd ◽  
Ccd Detector ◽  
Infra Red ◽  
High Level ◽  
Analogue To Digital

We report on the implementation of a FPGA-based ultra-violet (UV), infra-red (IR) visible (Vis) CCD spectrometer using a linear CCD detector operating at room temperature. The host interface is high-speed USB for data exchange with high-level environments such as Visual Basic, MATLAB and LABVIEW. The high-resolution intensity versus wavelength output is 8-bit digitized for secondary processing using a semi-flash analogue-to-digital converter (ADC) capable of sustained sampling rates of 20Mb/s.

Stability of topotecan infusion solutions in polyvinylchloride bags and elastomeric portable infusion devices

1999 ◽  
Vol 5 (2) ◽  
pp. 75-82 ◽  
Author(s):  
Irene Krämer ◽  
Judith Thiesen
Keyword(s):  
Sodium Chloride ◽  
High Performance ◽  
Room Temperature ◽  
Colour Change ◽  
Storage Period ◽  
Ultra Violet ◽  
Fluorescent Light ◽  
Nominal Concentration ◽  
Light Protection ◽  
Infusion Devices

Purpose. The purpose of this study was to determine the physicochemical stability of topotecan after reconstitution and after further dilution in two commonly used infusion fluids (0.9% sodium chloride, 5% dextrose) in both polyvinylchloride (PVC) bags and elastomeric portable infusion devices. Methods. Each vial of topotecan (Hycamtin®) was reconstituted with sterile water for injection, yielding a nominal concentration of 1 mg/mL. Topotecan infusion solutions were aseptically prepared by further dilution of reconstituted topotecan solutions with either 0.9% sodium chloride or 5% dextrose in both PVC bags and portable elastomeric infusion devices, in amounts yielding topotecan concentrations of 10 µg/mL, 25 µg/mL, or 50 µg/mL. Test solutions were stored light-protected at room temperature (25°C) or under refrigeration (2-8°C) in parallel. One test solution of the nominal concentration of 10 µg/mL topotecan in a 0.9% sodium chloride PVC infusion bag was stored under ambient light conditions (mixed daylight and normal laboratory fluorescent light) at room temperature. Topotecan concentrations were obtained periodically throughout a 4-week storage period via a stability-indicating high performance liquid chromatography assay with ultra-violet detection. In addition, measurements of pH values were performed regularly, and test solutions were visually examined for colour change and precipitation. Results. The stability tests revealed that the currently available topotecan formulation is stable (at a level of ≥90% topotecan) after reconstitution and dilution, independent of temperature (refrigerated, room temperature), the vehicle (0.9% sodium chlo-ride, 5% dextrose), the concentration (10 µg/mL, 25 µg/mL, or 50 µg/mL), or the container material (PVC bags, elastomeric portable infusion devices). The results were obtained over a test period of ≥4 weeks. Topotecan infusion solutions exposed to daylight were stable for only 17 days. Conclusions. Reconstituted and diluted topotecan infusion solutions are shown to be physicochemically stable for 4 weeks. Light protection during administration is not necessary.

scholarly journals Facile synthesis of ZnS quantum dots at room temperature for ultra-violet photodetector applications

2020 ◽  
Vol 742 ◽  
pp. 137127 ◽  
Author(s):  
Rujie Li ◽  
Libin Tang ◽  
Qing Zhao ◽  
Kar Seng Teng ◽  
Shu Ping Lau
Keyword(s):  
Quantum Dots ◽  
Room Temperature ◽  
Ultra Violet ◽  
Facile Synthesis
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